Question

$CN^-$ is strong field ligand. This is due to the fact that

• A. it carries negative charge
• B. it is a pseudohalide
• C. it can accept electrons from metal species
• D. it forms high spin complexes with metal species

Answer 1

Answer: (B)

it is a pseudohalide

Answer 2

$CN^-$ is a strong field ligand because it is an example of pseudohalide. Pseudohalide ions are stronger coordinating ligands and they have the ability to form a and $\pi$-bonds